tailieunhanh - Báo cáo lâm nghiệp: " The applicability of the Pipe Model Theory in trees of Scots pine of Poland"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: The applicability of the Pipe Model Theory in trees of Scots pine of Poland. | JOURNAL OF FOREST SCIENCE 54 2008 11 519-531 The applicability of the Pipe Model Theory in trees of Scots pine of Poland T. Jelonek1 W. Pazdrowski1 M. Arasimowicz2 a. Tomczak1 R. Walkowiak3 J. Szaban1 -Department of Forest Utilisation University of Life Sciences in Poznan Poznan Poland Department of Plant Ecophsiology Faculty of Biology Adam Mickiewicz University Poznan Poland department of Mathematical and Statistical Methods University of Life Sciences in Poznan Poznan Poland ABSTRACT In order to test the application importance of the Pipe Model Theory and to develop models for the share of sapwood in tree stems a total of 114 Scots pines Pinus sylvestris L. were felled within the natural range of this species in three natural positions located in northern and western Poland. The analyses were conducted on wood coming from trees from the main layer of the stand . the first three classes according to the classification developed by Kraft. Dependences were analyzed between the biometric characteristics of model trees . tree height diameter at breast height crown length crown basal area and the area and volume of sapwood in the stem. All the analyzed characteristics both biometric traits and sapwood characteristics were found to be correlated significantly P positively. Conducted analyses indicate that the postulates proposed in the Pipe Model Theory and Profile Theory require certain modifications and regression models developed for each social class of tree position in the stand for dependences of sapwood area and volume on the above mentioned biometric variables indirectly include changes occurring in time. Keywords Scots pine Pipe Model Theory sapwood tree crowns profile theory biometric traits The hydraulic architecture of plants has to serve several functions and overcome certain limitations. The maintenance of a continuous column of water in the plant minimizes the risk of cavitation Tyree Sperry 1989 Melcher et al. 2003 Sperry et al. 2003 as well